Algebra
x+5 = 12
x = 7
Find area of rectangle:
width = 7 , length = 4
A = 28
48+37-25
60
Find the missing number:
2, 4, 6, 8, _
10
A shirt costs 50$. The store gives a 20% discount. How much is the discount?
10
If number is divisible by 4, it is always divisible by 2.
True
2x = 14
x = 7
Perimeter of the triangle with sides 5, 7, 9
21
25x16
400
Find the next number :
3, 6, 12, 24, __
48
A price increases from 80 to 100. What is the percentage increase?
25%
If the perimeter of a square is 40, then its area is 100.
Answer : True
P =4a
4a = 40
a =10
Solve :
x2 - 1 = 15
x = 4 or x = -4
Area of triangle : base 12, height = 12
48
144:12+8
20
Find the next number: 1, 0, 1, 4, __
9
A jacket price first increases by 20% and then decreases by 20%. Is the final price the same as the original?
NO
100+20% =120
120-20%=96
If the average of three numbers is 15, then at least one of the numbers must be 15.
Answer: False
10+14+21 =45
45/3= 15
Factor: x2 + 5x +6
(x+2)(x+3)
Circumference of the radius with the diameter 16.
50.24
182-172
35
Find the missing number:
2, 6, 7, 21, 22, __
66
A number is increased by 30% and then decreased by 20 % and becomes 52.
What is the original number?
50
if a>b, then a2>b2
False
Solve system:
x+y = 10
x-y = 2
x = 6, y = 4
What is the length of straight line AB if A(1,2) and B(-2, 6)
5
99*101
9999
1, 3, 6, 10, 15, __
21
A worker earns a salary of $800 per month. Next year his salary increases by 10%, but after that the company reduces the new salary by 10%.
Question: What is the final salary?
$792
MENTAL MATH
100/5
20